Quick export : add size and color attribute

//functions.php

function custom_product_meta($array)
{
    $array[] = 'attribute_pa_color'; //sometimes it's just attribute_color
    $array[] = 'attribute_pa_size'; //sometimes it's just attribute_size
    return $array;
}
add_filter('wqep_included_order_product_keys_filter', 'custom_product_meta');